Search found 125 matches

by ddrown
Thu Jun 15, 2017 9:43 pm
Forum: Libary request
Topic: STM32 internal temperture sensor library?
Replies: 4
Views: 133

Re: STM32 internal temperture sensor library?

There's an example under A_STM32_Examples > General > InternalTempSensor, have you tried that?
by ddrown
Wed May 03, 2017 6:28 pm
Forum: Problems with libraries
Topic: RTC Library using LSE
Replies: 19
Views: 2180

Re: RTC Library using LSE

I've been experimenting with a LSE and I have some data: https://dan.drown.org/stm32/temp-lse.png At the peak you can see it's around 78.8ppm off (around 7 seconds per day day drift). After setting the RTC's calibration, I'm getting around 70ms per day (around 0.8ppm) https://dan.drown.org/stm32/rtc...
by ddrown
Sat Apr 29, 2017 7:15 pm
Forum: Projects
Topic: free logic analizer
Replies: 21
Views: 1216

Re: free logic analizer

I posted my sump device code here https://github.com/ddrown/stm32-sump

It's based on stmcubemx and uses dma and a timer to sample the gpio.
by ddrown
Mon Apr 24, 2017 3:36 am
Forum: General discussion
Topic: Problem with measuring very short pulses
Replies: 30
Views: 886

Re: Problem with measuring very short pulses

One way to do this is to use just the MISO pin of a SPI port: #include <SPI.h> void setup() { // Setup SPI 1 SPI.begin(); //Initialize the SPI_1 port. SPI.setBitOrder(MSBFIRST); // Set the SPI_1 bit order SPI.setDataMode(SPI_MODE0); //Set the SPI_2 data mode 0 SPI.setClockDivider(SPI_CLOCK_DIV128); ...
by ddrown
Wed Apr 12, 2017 8:36 pm
Forum: Projects
Topic: free logic analizer
Replies: 21
Views: 1216

Re: free logic analizer

with stm32f1 it would seem it may even be able to monitor at spi speeds (i.e. mhz), could be interesting to test that I have a proof of concept based on CubeMX on the blue pill board that uses a timer to drive DMA from GPIOA at 6MHz. It speaks the SUMP protocol over the USB port. If I use hand-code...
by ddrown
Thu Mar 30, 2017 6:58 pm
Forum: Generic STM32F103
Topic: Hackaday post/video on STM32duino
Replies: 4
Views: 298

Hackaday post/video on STM32duino

https://hackaday.com/2017/03/30/the-2-3 ... debugging/

They're recommending the new HAL based core and even go into getting debugging working
by ddrown
Thu Mar 23, 2017 8:50 pm
Forum: Custom design boards
Topic: STM32F030 custom board
Replies: 22
Views: 2134

Re: STM32F030 custom board

These are actually nice OCXO's http://www.ebay.com/itm/NEW-10MHz-OCXO-DIP-Micro-Crystal-x1pc-5x10E-11-Oven-Oscillator-OCVCXO-GPSDO-/252308905189 DS http://www.microcrystal.com/images/_PDF/7_Oven-Controlled-Oscillator/OCXO.pdf Uses less than 80ma@20c , 300ma@startup (10 sec) , they're 5v supplied Th...
by ddrown
Sun Mar 19, 2017 3:39 pm
Forum: General discussion
Topic: trying to understand how the compiler works...
Replies: 3
Views: 164

Re: [SOLVED] trying to understand how the compiler works...

OK, I think that the compiler generates the following code from #define write8(i++): digitalWrite(PB0, (i&BIT0)?HIGH:LOW); i++; digitalWrite(PB1, (i&BIT1)?HIGH:LOW); i++; digitalWrite(PB2, (i&BIT2)?HIGH:LOW); i++; digitalWrite(PB3, (i&BIT3)?HIGH:LOW); i++; digitalWrite(PB4, (i&BIT4)?HIGH:LOW); i++;...
by ddrown
Mon Mar 06, 2017 2:21 am
Forum: General discussion
Topic: Copying stm32 chip
Replies: 18
Views: 481

Re: Copying stm32 chip

I don't think it is protected. The esc can be upgraded with new firmware at any time. The thing is I have limited knowledge of this but whst I do know is the that the esc's board has 5 desitict areas where links have been made. I have back tracked and here are a list of pins on the stm32f051k6t6. R...
by ddrown
Sat Mar 04, 2017 5:25 pm
Forum: STLink
Topic: STM32 + Gotek floppy emulator
Replies: 29
Views: 1026

Re: STM32 + Gotek floppy emulator

I am interested in this topic too. I've been thinking about how to securely store an encryption key on the mcu. Enabling read protection and disabling the debugging peripheral seems like good first steps.